Foster hailed the contribution of United's goalkeeping coach Eric Steele for the innovative idea that helped the Reds gain the upper hand in the dramatic spot-kick lottery.
Steele and Foster were watching a video of Tottenham's penalty takers as the Reds keeper genned up on his opponents while the shoot-out finale was being set up.
The late homework reminder did the trick as the 25-year-old from Leamington Spa followed up Ryan Giggs' successful opening penalty by saving from Spurs' Jamie O'Hara. United never looked back and won the shoot-out 4-1.
"Eric Steele had done a lot of research into which way they are going to put their penalties. So we go into the shoot-outs as well equipped as we can be," said Ben.
"The iPod idea was a new one for us when Eric came to the club in the summer.
"I have never seen anything like it before. I don't think any of the other keepers have. It is a fantastic tool for us. It certainly helped us out at Wembley.
"Over the last couple of days we have had a lot of things to look at and study.
"Eric and I were then looking at the iPod with videos on it before the penalties were taken.
"It shows you clips of where players will normally put the ball that he has compiled for us.
"On top of that we try and find out as much information as we can about players even if it is some of the lads training with the opposition for England, for instance."
United's Champions League penalty shoot-out hero and normal first choice No1 Edwin Van der Sar also chipped in with some advice for Reds senior team rookie.
Advice
"I had a word with Edwin before the penalties as well because he hasn't got a bad record! You are going to take on board advice from him aren't you?" Foster added.
"I just remember him saying that if any of the young lads from Tottenham step up to take one then, within the laws of the game, try and be as intimidating as you can be.
"He said make yourself look big and so I stood up tall for as long as I could facing Jamie O'Hara in the first one and I managed to get to it. I was also delighted when I found out we were taking the penalties at the United end. You heard the boos when a Tottenham player walked up.
"I encouraged them because you have to because you want to win a medal. You have to do all you can do. They were a massive help."
Foster's League Cup medal was the first in a traumatic three-and-a-half years at Old Trafford since signing from Stoke City.
Two successful seasons on loan at Watford upped his profile, but injuries have since wrecked his progress at United.
"I have been at the club for three-and-a-half years and never had my hands on a medal. It has been a nightmare for me," he said.
"To finally get one and the way it was done was a massive boost for me. I am absolutely delighted."
Do you think Foster will be United's next number one? Have your say.
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Gilly, Belgium (02/03/2009 at 10:42)
He is way better than kitkat !